(1) All purchases made from funds of the city shall be made within the limits of the approved budgets and within the appropriation of the department, agency, or activity for which the purchase is made.
(2) No obligation of funds of the city shall be made except in compliance with the provisions of this chapter, or of the city's charter.
(3) All formal contract documents entered into by the city shall be reviewed by the city attorney prior to final execution.
(4) Any contract or agreement made in violation of the provisions of this chapter; the city charter, or other ordinances of the city shall be void and no expenditure shall be made thereunder. Every officer and employee who shall knowingly make or participate in any such contract or agreement, or authorize or make any expenditure thereunder, may be liable to the city for the full amount.